The scale of London’s air pollution crisis was laid bare on Wednesday, with new figures showing that every person in the capital is breathing air that exceeds global guidelines for one of the most dangerous toxic particles.

It also found that 7.9 million Londoners – nearly 95% of the capital’s population – live in areas that exceed the limit by 50% or more. In central London the average annual levels are almost double the WHO limit of 10 µg/m3.

Khan said: “It’s sickening to know that not a single area of London meets World Health Organisation health standards, but even worse than that, nearly 95% of the capital is exceeding these guidelines by at least 50%.”